While I specialize in bass fishing, I can certainly share some insights that crossover to steelhead fishing, especially when it comes to fly patterns. When fishing for summer steelhead on the Deschutes River with a floating line, there are a few fly patterns that are known to be quite effective.

1. Green Butt Skunk - This is a classic pattern that's been used for steelhead for many years. It's a good choice for clear water conditions and can be very effective in the morning or late evening.

2. Silver Hilton - Another traditional pattern that works well for steelhead. It's particularly effective in slightly off-colored water or when the fish are holding in deeper runs.

3. Purple Peril - The color purple is often a go-to for steelhead anglers. This pattern can be especially effective in shaded areas or during overcast days when the visibility is lower.

4. Muddler Minnow - While not a traditional steelhead fly, the Muddler can be effective when steelhead are feeding on smaller fish. It creates a good profile in the water and can be fished in a variety of ways.

5. Bomber - This is a dry fly pattern that can be skated across the surface to entice aggressive strikes from steelhead. It's a fun and exciting way to fish, especially in the summer months.

Remember, the key to successful fly fishing for steelhead is often presentation and adapting to the conditions of the river. Make sure to vary your retrieve and depth until you find what works. Also, be mindful of the river's insect hatches, as matching the hatch can sometimes make a significant difference.

Since my expertise is more centered around bass fishing, I recommend checking with local fly shops or experienced steelhead anglers on the Deschutes River for the most up-to-date and effective fly patterns for the current conditions. They can provide you with real-time insights that are invaluable when targeting these magnificent fish. Happy fishing!